exint2

My GTX has just developed a strange fault, wondered if any of you have had the same prob and therefore know of the fix.

1 when switched on the GTX works perfectly!

2 when it is switched off (but still connected to the cells) rather than doing nothing (as it has done previously) the motor now runs at about 10% power - which is a problem as I usually leave the cells connected to keep the cooling fans running.

any ideas?

Steve Weiss

Definately an odd problem...

Out of curiosity have you been running a schottky diode on your motor?

Running without one over time can cause degredation of the transistors and could possibly lead to a problem state like what you have described.

ittjv

iTrader: (32)

Hey Steve,
I thought the GTX had a built in Schottky diode? Should we be running an external one also?
Thanks!

Steve Weiss

The GTX does have internal schottky diodes but due to the nature of the schottky it is MUCH more effective the closer it is to the motor... so we always recommend running another schottky right on the motor whenever possible.

ittjv

iTrader: (32)

Could I run it on the deans plug (yup, I don't direct solder) and it still be effective? That way I don't have to solder a diode to every motor. Thanks for sharing this stuff!

Steve Weiss

Yeah, I suppose you could connect it with a Dean's plug and still be ok

exint2

Yes I do run a motor mounted schotky as well......

CarlosG.

iTrader: (12)

It sounds like a FET might have shorted out.

c-lyon

iTrader: (8)

A few years ago someone at Novak told me I could use a Schottky on a Deans as long as it was within 2 inches of the motor. I've had no problems doing this, and only need one per car.